public async Task <IActionResult> CreateReply([FromBody] CreateReplyCmd cmd)
        {
            var dep = new QuestionsDependencies();

            var replies = await _dbContext.Replies.ToListAsync();

            //var ctx = new QuestionsWriteContext(replies);
            _dbContext.Replies.AttachRange(replies);

            var ctx = new QuestionsWriteContext(new EFList <Reply>(_dbContext.Replies));

            //define
            var expr = from createTenantResult in QuestionsContext.CreateReply(cmd)
                       from checkLanguageResult in QuestionsContext.CheckLanguage(new CheckLanguageCmd(cmd.Body))
                       from sendAckAuthor in QuestionsContext.SendReplyAuthorAcknowledgement(new SendReplyAuthorAcknowledgementCmd(Guid.NewGuid(), 1, 2))
                       select createTenantResult;

            //execute
            var r = await _interpreter.Interpret(expr, ctx, dep);

            //_dbContext.Replies.Add(new DatabaseModel.Models.Reply { Body = cmd.Body, AuthorUserId = 1, QuestionId = cmd.QuestionId, ReplyId = 4 });
            //var reply = await _dbContext.Replies.Where(r => r.ReplyId == 4).SingleOrDefaultAsync();
            //reply.Body = "Text updated";
            //_dbContext.Replies.Update(reply);
            await _dbContext.SaveChangesAsync();

            //adapt
            return(r.Match(
                       succ => (IActionResult)Ok(succ.Body),
                       fail => BadRequest("Reply could not be added")
                       ));
        }